Two-stroke cycle engine

摘要

A two-stroke cycle engine having an improvement of its power output while reducing total hydrocarbons in the exhaust gases. The two-stroke cycle engine comprises a crank chamber (4) adapted to receive a fuel mixture through feed means and a combustion chamber (9) in a cylinder (1). Scavenging ports (5) are provided for communication between the combustion chamber and crank chamber to transfer the fuel mixture from the crank chamber to the combustion chamber while an exhaust port (3) is provided for exhausting the burned gases from the combustion chamber. Reciprocation of the piston (8) results in increase or decrease in volume of the combustion chamber while opening or closing the exhaust port and the scavenging ports. Communication means (10) are provided for communicating the exhaust port with the crank chamber via the scavenging ports to draw a portion of the burned gases from the exhaust port into the crank chamber when the piston is in its top dead center.